JP2890261B2 - Circuit for testing non-polar controlled components in control circuits - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Details of a circuit for testing a non-polar controlled component in a control circuit of the present invention will be described in accordance with the following items.

A. Industrial application fields B. Summary of the invention C. Prior art [Fig. 11, Fig. 12] a. General background [Fig. 11] b. Conventional example [Fig. 12] D. Invention will be solved E. Means for solving the problem F. Embodiment [FIGS. 1 to 10] F-1. First Embodiment [FIGS. 1 to 4] a. Circuit [FIG. , Fig. 2] a-1. Configuration [Fig. 1] a-2. Operation [Fig. 2] b. Application example [Figs. 3 and 4] b-1. Circuit [Fig. 3] b- 2. At the time of disconnection check [Fig. 4] c. Function F-2. Second embodiment [Fig. 5 to Fig. 10] a. Circuit [Fig. 5] b. Operation [Fig. 6] c. Example [Figs. 7 and 8] d. Application example [Figs. 9 and 10] d-1. First application example [Fig. 9] d-2. Second application example [Fig. 10] G. Effects of the Invention (A. Industrial Application Field) The present invention relates to a circuit for testing a non-polar controlled component in a novel control circuit. In detail, among the controlled components whose predetermined operation and characteristics are controlled by the control circuit, the operation and characteristics of the type of component having no polarity and operated independently of the direction of the current are checked. A controlled component can be tested by adding a test circuit with a simple configuration without removing the component from the control circuit and without providing a special check circuit or check terminal in the control circuit. It is an object of the present invention to provide a circuit for testing a non-polar controlled component in the new control circuit.

(B. Summary of the Invention) A first circuit for testing a non-polar controlled component in the control circuit of the present invention is a first circuit of a pair of signal input terminals to which a positive or negative DC voltage is input. First switch means is provided between the signal input terminal and the input terminal of the control circuit for controlling the drive of the non-polar controlled component, and the first switch means of the pair of control output terminals to which the non-polar controlled component is connected. A second switch means is provided on a bypass line connecting the first control output terminal and the first signal input terminal, and a non-polar circuit in a control circuit in which the second signal input terminal and the second control output terminal are connected. A test circuit for testing a control component, the test circuit comprising:
The second switch means and the second switch means perform reciprocal switching operation in accordance with the direction of the voltage applied to the signal input terminal, and the control signal has a polarity when checking the operation and characteristics of the non-polar controlled component. The second switch means is closed by applying a test signal having a different signal to the signal input terminal from the outside, and the signal is controlled based on the presence or absence and magnitude of the current of the controlled component through the bypass line closed by this. The control component can be checked. The second and third components have an input between a pair of signal input terminals to which an AC control signal or a positive or negative test signal is input. Voltage detection means for determining whether the magnitude of the voltage is within a predetermined range is provided, and a first control signal output terminal among control output terminals to which the non-polar controlled component is connected and a drive control of the controlled component. Between the first signal input terminal and the first control output terminal and between the first signal input terminal and the first control output terminal. A second switch means provided on a bypass line connecting the second signal input terminal and the second control output terminal, the test circuit for a non-polar controlled component in a control circuit connecting the second signal input terminal and the second control output terminal. A switch control means for reciprocally switching the first switch means and the second switch means in response to a signal from the voltage input detection means, and only when the magnitude of the input voltage is within a predetermined range, The first switch means is closed by the control means and the second switch means is closed by the switch control means only when the input voltage exceeds a predetermined range. Switch control means for receiving a signal from the voltage detection means only when the magnitude is within a predetermined range and closing the first switch means is provided, and the second switch means is closed only when the input voltage exceeds a predetermined range. In these, when a non-polar controlled component is checked, if a positive or negative test signal that is sufficiently larger than the control voltage is applied, the first
And the second switch means is closed and the bypass line is closed, so that the operating characteristics of the controlled component can be checked while the controlled component remains connected between the control output terminals. In addition, no complicated check circuit or check terminal is required in the control circuit, and an increase in the number of components and an accompanying malfunction do not occur.

(C. Conventional technology) [Fig. 11 and Fig. 12] (a. General background) [Fig. 11] It has no polarity and has no relation to the direction of current like actuators such as relays and motors and lamps An electric component (hereinafter referred to as a “non-polar controlled component”) that operates only when a current flows through the control circuit is connected between a pair of output terminals of the control circuit and is connected to the control circuit through a pair of input terminals. Normally, the operation is controlled by a signal sent to the device.

FIG. 11 shows an example a of a control circuit in the case of taking a relay as an example of a non-polarity controlled component.

The control circuit a is composed of an NPN transistor b whose emitter is grounded, and a PNP transistor c arranged at the subsequent stage. That is, the base of the NPN transistor b is connected via the resistor d to the plus input terminal e of the signal input terminals e and e '.
, A resistor f is interposed between the base and the emitter, the collector of which is connected to the power supply terminal h via the resistor g, and the base of the PNP transistor c is connected to the NPN through the resistor i. The transistor b is connected to the collector, the emitter is connected to the power supply terminal h, and the collector is connected to the plus output terminal j of the output terminals j and j '.

k is a relay, both terminals m and m 'of the coil 1 are respectively connected to output terminals j and j' of the control circuit a, and the contact n is used as a control contact of another circuit (not shown). .

When an input signal is sent to the control circuit a via the signal input terminals e and e 'while a predetermined voltage is applied to the power supply terminal h, the transistors b and c are switched accordingly. , The on / off operation of the relay k is controlled.

(B. Conventional example) [FIG. 12] However, when it is to be tested whether or not the controlled component has the expected operating characteristics in the circuit a as described above, the controlled component must be connected to the control circuit. There is a problem that it has to be removed from the output terminal and determined by a check device such as a tester.

In the case of the relay k described above, since there is a relay with a socket, the relay unit can be removed from the socket and the presence or absence of disconnection of the coil l can be determined by a tester. Over time, there is no guarantee that such a method will always be possible.

Therefore, it is conceivable that a control circuit is provided in advance with a check circuit for diagnosing the operating characteristics of the controlled component and a check output terminal for extracting the check result.

In the case of the control circuit a, for example, as shown in FIG. 12, a PNP transistor p is used as a check circuit o, the emitter of which is connected to a check output terminal r via a signal line q, and a resistor s is connected. A circuit configuration in which the transistor p is connected to the power supply terminal h, the terminal opposite to the transistor p of the base resistance t of the transistor p is connected to the plus output terminal j of the control circuit a, and the power supply terminal h is connected via the resistor u Can be considered. In this case, no control signal is applied to the signal input terminals e and e 'of the control circuit a, and when a predetermined voltage is applied to the power supply terminal h, the transistor p is turned on unless the coil l of the relay k is disconnected, and the check is performed. Output terminal q
A signal is output, and if the coil 1 is disconnected, the transistor p remains off, so that an H signal is output to the check output terminal r.

(D. Problems to be Solved by the Invention) However, the above check circuit is designed for each controlled component in a timely manner so as not to affect the operation of the control circuit. Therefore, there is a problem that the check circuit may be complicated in some cases, which may cause malfunction and cost increase due to an increase in the number of components.

(E. Means for Solving the Problems) In order to solve the above-described problems, the non-polar controllable component test circuit in the control circuit of the present invention is driven and controlled by a DC signal. In the case, a pair of signal input terminals to which a control signal or a test signal of the opposite polarity is inputted, and a pair of control output terminals to which a non-polar controlled component is connected are provided. First switch means is provided between an input terminal of a control circuit for performing drive control and the first signal input terminal, and a first switch means is provided on a bypass line connecting the first signal input terminal and the first control output terminal. A second switch means is provided, wherein the second signal input terminal is connected to the second control output terminal in the control circuit for testing the non-polar controlled component in the control circuit; Communication with the second switch means The switching operation is performed reciprocally according to the direction of the voltage applied to the input terminal.If the non-polar controlled component is driven and controlled by an AC signal, an AC control signal or a positive or negative voltage is applied. It has a pair of signal input terminals to which a test signal is input, and a pair of control output terminals to which a non-polar controlled component is connected, detects an input voltage and determines whether or not this magnitude is within a predetermined range. Voltage detecting means is provided between the signal input terminals, and between the output terminal of the control circuit and the first control output terminal or between the first signal input terminal and the control circuit for controlling the driving of the non-polar controlled component. A first switch means is provided between the first signal input terminal and the first control output terminal, and a second switch means is provided on a bypass line connecting the first signal input terminal and the first control output terminal. Input terminal is 2nd A test circuit for testing a non-polar controlled component in a control circuit connected to a control output terminal, wherein said first switch means and said second switch means are reciprocally switched according to a signal from a voltage input detection means; A switch control means for operating is provided, and the first switch means is closed by the switch control means only when the magnitude of the input voltage is within a predetermined range, and the second switch is provided by the switch control means only when the input voltage exceeds the predetermined range. So that the means can be closed,
Alternatively, switch control means for receiving the signal from the voltage detection means only when the magnitude of the input voltage is within a predetermined range and closing the first switch means is provided, and the second control means is provided only when the input voltage exceeds the predetermined range. Is closed.

Therefore, according to these, the operation characteristics of the controlled component can be checked while the controlled component remains connected between the control output terminals, and a complicated check circuit and a check terminal for that purpose are provided. It is not required in the control circuit, and does not cause an increase in the number of components or an accompanying malfunction.

(F. Embodiment) [FIGS. 1 to 10] Hereinafter, details of a circuit for testing a non-polar controlled component in a control circuit according to the present invention will be described with reference to each of the illustrated embodiments.

(F-1. First Embodiment) [FIGS. 1 to 4] FIGS. 1 to 4 show a circuit for testing non-polar controlled components in a control circuit of the present invention, which is used as a control circuit for DC signal input. 1 shows a first embodiment to which the present invention is applied.

(A. Circuit) [FIGS. 1 and 2] FIG. 1 shows a circuit block of the DC control circuit 2.

(A-1. Configuration) [FIG. 1] 3, 3 'are signal input terminals, one of which is connected to the anode of a diode 5 via a signal line 4, and the other 3' is connected to a signal line 4 '. It is connected. During normal control, the signal line 4 is a positive line, and the signal line 4 'is a ground line.

Reference numeral 6 denotes a control circuit whose input terminal is connected to the cathode of the diode 5 and whose ground terminal is connected to the signal line 4 '.

7, 7 'are control output terminals, one of which is connected to the output terminal of the control circuit 6, and the other 7' is a signal line 4 '.
It is connected to the.

Reference numeral 8 denotes a non-polar controlled component whose control terminal is connected to the control output terminals 7 and 7 ', respectively.

Reference numeral 9 denotes a bypass line connecting the signal input terminal 3 and the control output terminal 7. On the bypass line 9, a resistor 10 and a diode 11 connected in series are provided.
Is connected to the control output terminal 7,
The cathode of the diode 11 is connected to the signal line 4.

(A-2. Operation) [FIG. 2] Next, the operation of the test circuit 1 at the time of checking will be described. In the waveform diagram schematically shown in FIG. 2, CS indicates a control signal, and TS indicates a test signal, which have opposite polarities. That is, when the control signal CS has a positive voltage, the test signal TS has a negative voltage. If the connection state of the diodes 5 and 11 is reversed, the control signal CS can be set to a negative voltage and the test signal TS can be set to a positive voltage.

Thus, when the control signal CS is input to the signal input terminals 3 and 3 ', the diode 5 is turned on, the control signal CS is input to the control circuit 6 as it is, and the control circuit 6 responds to the control signal CS. Thus, the non-polar controlled component 8 is controlled. At this time, since the diode 11 on the bypass line 9 is in the off state, the control signal CS is not transmitted to the non-polarity controlled component 8.

Also, the test signal TS from the check device 12 such as a tester is used.
Is input through the signal input terminals 3 and 3 ', the diode 5 is turned off, the test signal TS is not input to the control circuit 6, and the diode 11 is turned on, so that the signal input terminal 3' → signal line 4 ′ → Control output terminal 7 ′ → Non-polarity controlled component 8 → Control output terminal 7 → Bypass line 9 → Resistance 10 and diode 11 → Signal input terminal 3 The presence or absence of the flowing current and the current value can be detected by the check device 12 to detect the operating state and characteristics of the non-polar controlled component 8.

(B. Application Example) [FIGS. 3 and 4] Next, a circuit for checking disconnection of a relay coil in a control circuit in the case where a relay is used as the nonpolar controlled component 8 will be described. In this application example, the same parts as those of the test circuit 1 described above are denoted by the same reference numerals as those of the same parts in the test circuit 1, and the description thereof is omitted.

(B-1. Circuit) [FIG. 3] 13 is a relay control circuit, in which the base of an NPN transistor 14 having a common emitter is connected to the cathode of the diode 5 via a resistor 15 and between the base and the emitter. A resistor 16 is inserted, and its collector is connected to a power supply terminal 18 of a power supply circuit (not shown) via the resistor 17. The base of the PNP transistor 19 is connected to the collector of the transistor 14 via the resistor 20, the emitter is connected to the power supply terminal 18, and the collector is connected to the control output terminal 7. Reference numeral 21 denotes a relay. Both terminals of a coil 21a are respectively connected to control output terminals 7, 7 'of a relay control circuit 13, and a contact 21b is used as a control contact of another circuit (not shown). ing.

A resistor 22 has one end connected to the cathode of the diode 11, the other end connected to the cathode of the diode 23, and the anode of the diode 23 connected to the signal line 4 '. Note that this resistor 22 and diode
23 is provided for protecting the transistor 14 in the input stage of the relay control circuit 13 because a test voltage TS having a polarity opposite to the control voltage is applied at the time of the test. Unnecessary when high.

(B-2. At the time of disconnection check) [FIG. 4] However, the equivalent circuit 24 at the time of disconnection check of the relay coil 21a is as shown in FIG. That is, the relay
One end of the coil 21a of the 21 is a resistor 25 provided on the bypass line (this resistance is R ₂₅ (Ω). If the resistance of the relay coil 21a is ignored, R ₂₅ is the resistance R of the resistor 10).
₁₀ (Ω) and the resistance value of the resistor ₂₂ (equal to the combined resistance value of ₂₂ (Ω)) and the diode 11 are connected to the signal input terminal 3, and the other end of the relay coil 21 a is connected via the signal line 4 ′. It is connected to the signal input terminal 3 '. In addition, as an equivalent circuit 26 of the checking device 12, the positive terminal of a DC power supply 27 (power supply voltage is represented by E (V)) is connected to one of detection terminals 29 and 29 'via an ammeter 28. The negative terminal is connected to the other detection terminal 29, and these detection terminals 29 and 29 'are connected to the signal input terminals 3, 3' of the relay control circuit 13.
Are connected to each other.

Therefore, as shown in FIG.
Is not disconnected, the test voltage E from the circuit 26 is applied to the signal input terminals 3, 3 ', while 3 is at a negative potential,
On the other hand, the diode 3 is turned off because the potential of 3 'becomes positive,
Since the base-emitter of the transistor 14 is reverse-biased, the transistors 14, 19 and the relay 21 are kept off, and the diode 23 is turned on, so that the transistor 14 is protected. Then, the diode 11 turns on, and the current value I (A) flowing through the equivalent circuit 24 becomes Next, by selecting the resistance value such that R ₂₂ >> R _10, About.

In addition, if the relay coil 21a is disconnected as shown in FIG. 4B, the current I ≒ 0, so that the disconnection of the relay coil 21a can be known from the display of the ammeter 28.

(C. Operation) According to the first embodiment of the test circuit for the non-polar controlled component in the control circuit of the present invention, when the control signal CS is input, the signal input to the control circuit 6 is stopped. Diode 5 as a switch means to permit and bypass line 9
A diode 11 is provided as switch means for closing
When the diodes 5 and 11 receive the control signal CS and the test signal TS
When the test signal TS is input, the signal input to the control circuit 6 is cut off and the bypass line 9 is closed. The check operation can be easily performed by the external check device 12 by adding a small number of circuit components to the control circuit without providing a check circuit and a check terminal.

(F-2. Second Embodiment) [FIGS. 5 to 10] Next, FIGS. 5 to 10 show a second embodiment 1A of the test circuit for the non-polar controlled component in the control circuit of the present invention. Explanation will be given according to FIG. The second embodiment 1A is one in which the present invention is applied to an AC signal input control circuit.

(A. Circuit) [FIG. 5] Reference numerals 30 and 30 'denote signal input terminals, while 30 is connected to an input terminal of a control circuit 32 through a switch 31.
When a transfer contact of a relay is used as the switch 31, for example, its NO (normally open) contact is opened and the other NC (normally closed) is opened.
A contact is connected to the signal input terminal 30, and the signal line 33 between them is a plus line during normal control. The other signal input terminal 30 'is connected to one of the control output terminals 34 and 34' of the control circuit 32 via a signal line 33 '. Line.

Reference numeral 35 denotes a switch, which is a signal input terminal 30 and a control output terminal.
When the transfer contact of the relay is used as the switch 35, the NC contact side is opened, and when the switch is switched to the NO contact side, the signal input terminal 30 and the control output are provided. Is connected to the terminal 34,
The bypass line 36 is closed.

Reference numeral 37 denotes a voltage detection circuit connected between the signal input terminals 30 and 30 'immediately after the signal input terminals 30 and 30', detects the voltage value of the input signal, and sets the absolute value of the input voltage to a predetermined value ( _Vref (V)
) Is provided to determine whether it is within.

Reference numeral 38 denotes a switch control circuit, which is arranged at a stage subsequent to the voltage detection circuit 37, and is provided for performing switching control of the switches 31, 35 according to a signal from the voltage detection circuit 37. That is, the switch control circuit 38 outputs the input voltage (which is
V _I (V)) when | V _I | ≧ V _ref
Switching to the NO contact side interrupts the signal input to the control circuit 32, and controls the switch 35 to the NO contact side to close the bypass line.

Reference numeral 39 denotes a non-polar controlled component whose control terminal is connected to the control output terminals 34 and 34 'of the control circuit 32, respectively.

(B. Operation) [FIG. 6] The operation of the test circuit 1A at the time of checking is as follows. In the waveform diagram schematically shown in FIG.
CS indicates a control signal, and TS ⁽⁺⁾ and TS ^(-) indicate test signals of a positive voltage and a negative voltage, respectively, and the absolute values of these voltages are set to _Vref or more.

First, when the control signal CS is input via the signal input terminals 30 and 30 ', since | V _I | is less than V _ref , this is determined by the voltage detection circuit 37, and A signal is sent to the switch control circuit 38, whereby the switches 31, 35 are set to the NC contact side. Therefore, the control signal CS is directly input to the control circuit 32, and the control circuit 32 controls the operation of the non-polar controlled component 39 according to the control signal CS.

In addition, the detection terminals of the external check device 40 are separately connected to the signal input terminals 30, 30 ', and the test signal TS ⁽⁺⁾ or TS ^(-) is applied from the check device 40 to the signal input terminals 30, 30'. Is determined by the voltage detection circuit 37 as | V _I | ≧ V _ref, and the switch control circuit 38 switches the switches 31 and 35 to the NO contact side, so that the test signal TS ⁽⁺⁾ or TS
^(-) Is not input and the test signal T
S ⁽⁺⁾ or TS ^(-) will be added directly.

Therefore, current flows in response to the test signal TS ' ⁽⁺⁾ or TS ^(-) through the closed bypass line 36 in the check device 40, thereby changing the operating characteristics of the non-polar controlled component 39. It becomes possible to check.

(C. Modification) [FIGS. 7 and 8] FIG. 7 shows a modification 41 of the test circuit 1A.

Note that, of the portions of the modification 41, the same portions as those of the test circuit 1A are denoted by the same reference numerals as those of the same portions in the test circuit 1A, and description thereof will be omitted.

Reference numeral 42 denotes a switch, which is provided at a stage subsequent to the control circuit 32, and is opened and closed under the control of the switch control circuit 38.

A bypass line 43 connects the signal input terminal 30 and the control output terminal 34. On the bypass line 43, opposed zener diodes 44 and 45 are provided. That is, the anode of the Zener diode 44 is connected to the signal line 33, and the cathode thereof is connected to the cathode of the other Zener diode 45. The anode of the Zener diode 45 is connected to the control output terminal 34 via the resistor 46. Incidentally, the Zener voltage of the Zener diode 44 and 45 are the respective _{ZD 44, ZD 45 (V)} .

Thus, the operation of the test circuit 41 is performed as follows.

In the waveform diagram shown in FIG. 8, CS is a control signal, TS ' ⁽⁺⁾ , T
S ′ ⁽⁻⁾ indicates a test signal, and the voltage value of the test signal TS ′ ⁽⁺⁾ is equal to or higher than the Zener voltage ZD _45, and
S ^'(-) voltage value is a -ZD ₄₄ or less.

First, the control signal CS is the absolute value is less than ZD _44, ZD ₄₅ of the input voltage when input, thus voltage detection circuit
The switch 42 is closed by the switch 37 and the switch control circuit 38. Therefore, the non-polarity controlled component 39 is controlled according to the control signal CS input to the control circuit 32. At this time, the Zener diodes 44 and 45 are both off.

When the test signal TS ' ⁽⁺⁾ or TS' ^(-) is input, the switch 42 is opened and the Zener diode 45 is opened.
Or, 44 is turned on, and the bypass line 43 is closed.

(D. Application example) [FIGS. 9 and 10] FIGS. 9 and 10 show an example in which a motor is used as a non-polar controlled component and a positive voltage test signal TS ⁽⁺⁾ is used. An application example will be described. Note that in this application example, the same portions as those of the test circuit 1A or the modification 41 described above are denoted by the same reference numerals as those of the similar portions in 1A or 41, and the description thereof is omitted.

(D-1. First Application Example) [FIG. 9] FIG. 9 is via the circuit of the first application example 47, and an amplifying circuit 49 for driving a motor 48 is provided as the control circuit 32. The voltage detection circuit 37 is connected to the signal line 33,
It comprises a zener diode 50 and a resistor 51 connected in series between 33 '. The Zener diode 50
The zener voltage corresponds to the reference voltage _Vref of the voltage detection circuit 37.

And, as the switch control circuit 38,
An NPN transistor 52 is used, its base is connected between the Zener diode 50 and the resistor 51 via a resistor 53, and its collector is connected via a coil 54a of a relay 54 and a diode 55 connected in parallel to the coil 54a. Connected to a power supply terminal of a power supply circuit (not shown). The transformer contacts 54b and 54c of the relay 54 correspond to the switches 31 and 35, respectively.

Thus, when the test signal TS ⁽⁺⁾ is input, the zener diode 50 is turned on, the transistor 52 and the relay 54 are turned on, the transfer contact 54b of the relay is opened, the transfer contact 54c is closed, and the bypass line 36 Is closed.

(D-2. Second Application Example) [FIG. 10] FIG. 10 shows a second application example 56 in which no mechanical contact is used as the switches 31 and 35.

That is, the FET 57 corresponding to the switch 31 is provided on the signal line 33, the source is connected to the signal input terminal 30 via the resistor 58, and the drain is connected to the input terminal of the amplifier circuit 49. A resistor 59 is interposed between the gate and the source of the FET 57, and a damper diode 60 is provided between the drain and the source.

The voltage detection circuit 37 is composed of a zener diode 50 and a resistor 51 connected in series between the signal lines 30 and 30 ', as in the first application example 47. As the switch control circuit 38, NPN transistors 61 and 62 whose emitters are grounded are used. On the other hand, the base of 61 is connected between the Zener diode 50 and the resistor 51 via the resistor 63 and the collector thereof is connected. The transistor 62 is connected via a resistor 64 to a power supply terminal of a power supply circuit (not shown), and a transistor 62 arranged at a stage subsequent to the transistor 61 has a base connected to the collector of the transistor 61 and a collector connected via a resistor 65. It is connected to the gate of the FET 57.

66 is a diode and 67 is a Zener diode, which are provided on the bypass line 43 in a state of facing each other. In other words, the diode 66 is connected to the signal line
33, and the cathode thereof is connected to the cathode of the Zener diode 67.
67 asodes are connected to the control output terminal 34.

Further, the Zener voltage of the Zener diode 67 and the Zener voltage of the Zener diode 50 are substantially equal.

68 is a resistor connected between the input terminal of the amplifier circuit 49 and the signal line 33 '.

Thus, when the test signal TS ⁽⁺⁾ is input in the second application example 56, the zener diode 50 and the transistor 61 are turned on, the transistors 62 and 57 are turned off, and the input to the amplifier circuit 49 is cut off. The output voltage of the circuit 49 becomes approximately zero. At the same time, the Zener diode 67 turns on and the bypass line 43 is closed.

In addition, when the control signal CS is input, each element is in a state completely opposite to the above, and the motor 48 is controlled according to the control signal CS.

(G. Effect of the Invention) As is clear from the above description, the first circuit for testing a non-polar controlled component in the control circuit of the present invention receives a control signal or a test signal having a polarity opposite to that of the control signal. And a first signal input terminal of a control circuit having a pair of control input terminals to which the non-polar controlled component is connected and a drive control of the non-polar controlled component. , A second switch is provided on a bypass line connecting the first signal input terminal and the first control output terminal, and a second signal input terminal is provided. A test circuit for a non-polar controlled component in a control circuit connected to a second control output terminal, wherein the first switch means and the second switch means are connected to a signal input terminal. Switch reciprocally according to In the second aspect, a pair of signal input terminals to which an AC control signal or a test signal of a positive voltage or a negative voltage is input and a non-polar controlled component are connected. And a pair of control output terminals,
Voltage detecting means for detecting an input voltage and determining whether or not the magnitude is within a predetermined range is provided between the signal input terminals, and an output terminal of a control circuit for performing drive control of the non-polar controlled component and a second terminal. A first switch means is provided between the first control output terminal or the first signal input terminal and the input terminal of the control circuit, and the first signal input terminal and the first control output terminal are connected to each other. A second switch means provided on the connecting bypass line, wherein the second signal input terminal is a circuit for testing a non-polar controlled component in a control circuit connected to the second control output terminal; Switch control means for reciprocally switching the first switch means and the second switch means in response to a signal from the means;
The first switch means is closed by the switch control means only when the magnitude of the input voltage is within a predetermined range, and the second switch means is closed by the switch control means only when the input voltage exceeds the predetermined range. A third signal input terminal to which an AC control signal or a positive or negative voltage test signal is input,
A pair of control output terminals to which the non-polar controlled component is connected, and voltage detection means for detecting an input voltage and determining whether or not the magnitude is within a predetermined range is provided between the signal input terminals. The first switch means is provided between an output terminal of a control circuit for performing drive control of the non-polar controlled component and a first control output terminal or between a first signal input terminal and an input terminal of the control circuit. And a first signal input terminal and a first signal input terminal.
A second switch means is provided on a bypass line connecting to the control output terminal of the second control output terminal, and a second signal input terminal is a circuit for testing non-polar controlled components in a control circuit connected to the second control output terminal. There is provided a switch control means for receiving a signal from the voltage detection means only when the magnitude of the input voltage is within a predetermined range and closing the first switch means. The second switch means is closed.

Therefore, according to these, the operation and characteristics of the controlled component can be checked while the non-polar controlled component remains connected between the control output terminals, and a complicated check circuit and check for that purpose can be performed. No terminal is required in the control circuit, and there is no danger of a remarkable increase in the number of components and associated malfunctions.

[Brief description of the drawings]

1 to 4 show a first embodiment of a circuit for testing non-polar controlled components in a control circuit according to the present invention.
FIG. 2 is a block diagram, FIG. 2 is a waveform diagram schematically showing a control signal and a test signal, FIG. 3 is a circuit diagram showing an example of application, FIG. 4 is an equivalent circuit diagram at the time of a test, and FIGS. 10 shows a second embodiment of a circuit for testing non-polar controlled components in the control circuit of the present invention, FIG. 5 is a block diagram, and FIG. 6 is a waveform schematically showing a control signal and a test signal. FIG. 7, FIG. 7 is a block diagram showing a modification, FIG. 8 is a waveform diagram schematically showing a control signal and a test signal, FIG. 9 is a circuit diagram showing a first application example, and FIG. Circuit diagram showing an application example of
FIG. 11 is a circuit diagram showing an example of a general configuration of a control circuit, and FIG.
FIG. 1 is a circuit diagram showing an example of a conventional control circuit including a check circuit. DESCRIPTION OF SYMBOLS 1 ... test circuit for non-polar controlled component in control circuit 2 ... control circuit 3 ... first signal input terminal 3 '
... second signal input terminal, 5 ... first switch means,
7: first control output terminal, 7 ': second control output terminal, 8: non-polar controlled component, 9: bypass line,
11 ... second switch means, 13 ... control circuit, 21 ... non-polar controlled component, CS ... control signal, TS ... test signal of opposite polarity (to control signal), 1A ... control circuit , A circuit for testing a non-polar controlled component at 30, a first signal input terminal,
30 '... second signal input terminal, 31 ... first switch means, 34 ... first control output terminal, 34' ... second control output terminal, 35 ... second switch, 36 ... bypass line, 37 ... voltage detection means, 38 ... switch control means, 39
… Non-polar controlled component, CS… AC control signal, TS ⁽⁺⁾
… Positive voltage test signal, TS ^(-) … Negative voltage test signal, 4
1 ... Circuit for testing non-polar controlled components in the control circuit, 42 ... First switch means, 43 ... Bypass line, 44, 45 ... Second switch means, CS ... AC control signal, TS ' ⁽⁺⁾ ... Positive voltage test signal, TS' ^(-) ... Negative voltage test signal, 47 ... Non-polar controlled component test circuit in control circuit, 48 ... Non-polar controlled component , 49 ... control circuit, 50, 51 ... voltage detection means, 52, 54 ... switch control means, 54 b ... first switch means, 54 c ... second switch means, 56 ... non-polarity in the control circuit Circuit for testing a controlled component, 57... First switch means, 61, 62.
Switch control means, 66, 67 ... second switch means

Claims (3)

(57) [Claims] A non-polar controlled component having a pair of signal input terminals to which a control signal or a test signal of the opposite polarity is input and a pair of control output terminals to which a non-polar controlled component is connected. A first switch means is provided between an input terminal of a control circuit for performing drive control of the first signal input terminal and a first signal input terminal, and on a bypass line connecting the first signal input terminal and the first control output terminal. A control circuit for testing a non-polar controlled component in a control circuit in which a second signal input terminal is connected to a second control output terminal, wherein the first switch means is provided. A circuit for testing a non-polar controlled component in a control circuit, characterized in that the switching circuit and the second switch means perform reciprocal switching operations according to the direction of the voltage applied to the signal input terminal. And a pair of control output terminals to which a non-polar controlled component is connected, and a pair of signal input terminals to which an AC control signal or a test signal of a positive voltage or a negative voltage is input. And a voltage detecting means for detecting whether the magnitude is within a predetermined range is provided between the signal input terminals, and an output terminal of a control circuit for controlling the drive of the non-polar controlled component and the first terminal. A first switch is provided between the control output terminal or between the first signal input terminal and the input terminal of the control circuit, and a bypass connecting the first signal input terminal and the first control output terminal is provided. A second switch means is provided on the line, and a second signal input terminal is a test circuit for a non-polar controlled component in a control circuit connected to the second control output terminal. The first switch according to the signal Switch means for reciprocally switching the switch means and the second switch means, and only when the magnitude of the input voltage is within a predetermined range, the first switch means is closed by the switch control means and the input voltage falls within a predetermined range. A circuit for testing a non-polar controlled component in a control circuit, wherein the second switch means is closed only by the switch control means when the value exceeds And a pair of signal input terminals to which an AC control signal or a test signal of a positive voltage or a negative voltage is inputted, and a pair of control output terminals to which a non-polar controlled component is connected. And a voltage detecting means for detecting whether the magnitude is within a predetermined range is provided between the signal input terminals, and an output terminal of a control circuit for controlling the drive of the non-polar controlled component and the first terminal. A first switch is provided between the control output terminal or between the first signal input terminal and the input terminal of the control circuit, and a bypass connecting the first signal input terminal and the first control output terminal is provided. A second switch means provided on the line, wherein the second signal input terminal is a circuit for testing a non-polar controlled component in a control circuit connected to the second control output terminal; Is only within the specified range. And a switch control means for closing the first switch means in response to a signal from the control circuit, and the second switch means is closed only when the input voltage exceeds a predetermined range. Circuit for testing non-polar controlled components